We reexamine the charm contribution to atmospheric lepton fluxes in the context of perturbative QCD. We include next-to-leading order corrections and discuss theoretical uncertainties due to the extrapolations of the gluon distributions at small x. We show that the charm contribution to the atmospheric muon flux becomes dominant over the conventional contribution from π and K decays at energies of about 10⁵ GeV. We compare our fluxes with previous calculations.
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Pasquali et al. (1999) studied this question.
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